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本文报道对水合Cr(III)离子的聚合过程及其生成多核化合物进行研究的结果.配制几组硝酸铬溶液,使其中Cr(III)离子浓度和pH值不同而离子强度相同.一般约需一个月始达平衡,然后测定其pH值.数据按“根+节”理论处理,结果表明溶液中生成一系列通式为Cr[Cr(OH)_2]_n~((3+n)+)的络合物,式中n=1,2和3.用曲线拟合法、投影带法、曲线外推法等三种方法计算,所得平衡常数K_n极为一致.
In this paper, the polymerization process of hydrated Cr (III) ions and the production of polynuclear compounds were studied. Several groups of chromium nitrate solutions were prepared, in which the concentration of Cr (III) ions and the pH value were the same while the ionic strength was the same. Month and then the pH value was measured.The data were processed according to the theory of “root plus node”, and the results showed that a series of Cr (OH) 2] _n ~ ((3 + n) +) Complexes, where n = 1, 2 and 3. By curve fitting, projection zone method, curve extrapolation and other three methods of calculation, the resulting equilibrium constant K_n very consistent.